credential-helpers + remote-helper, starting point?

Hello,

I want to know if anyone can help me with git-credential-helpers we are 
trying to use git-credential-helpers in the git-mediawiki (implemented 
as a remote-helper).
We need to ask for the login/pass of the wiki and it would be nice if 
we can use credential-helpers to manage this credentials.

Anyone can send me a starting point, like a url with the documentation 
of git-credential-helpers?
To see how we can import credential-helpers for used with mediawiki.